The ritual, held every year to mark Good Friday in Asia's bastion of Catholicism, has been going on for decades, becoming a major tourist draw despite official disapproval from Church leaders.
Organisers said at least nine men were scheduled to be nailed to wooden crosses this year in farming districts in the city of San Fernando, 65 kilometres north of Manila.
The tradition also includes hundreds of hooded "penitents" flogging themselves with makeshift whips on the sidelines, sometimes accidentally splattering their blood onto onlookers.
In the first session, three men dressed as Christ took turns having three-inch (7.6-centimetre) stainless steel nails driven through their hands, pinning them to crosses as other villagers -- dressed as Roman centurions -- looked on.
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Two of the men were later carried off on stretchers but another, named Rolly Pantoja, walked off on his own, raising his hands to show they were still bleeding.
She conceded that the spectacle has been a big revenue-earner for hotels and vendors hawking drinks, food and souvenirs, but she denied that the city government is commercialising the event.
"It's not a money-making scheme for the city government. Although we are not promoting it as a tourist destination, we cannot stop the influx of people to this district during Holy Week," she told AFP.
She said San Fernando was spending half a million pesos (USD 11,300) on extra security and traffic assistance for the event.